package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websoket.WebSocketServer;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.*;
import java.util.stream.Collectors;

@Service
public class OrderServiceImpl implements OrderService    {
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WebSocketServer server;

    //用户下单
    @Override
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO dto) {
        Long id = BaseContext.getCurrentId();
        //处理异常(地址为空，购物车为空)
        AddressBook address = addressBookMapper.getById(dto.getAddressBookId());
        if (address==null)
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        QueryWrapper<ShoppingCart> wrapper = new QueryWrapper<>();
        wrapper.eq("user_id",id);
        List<ShoppingCart> shoppingCarts = shoppingCartMapper.selectList(wrapper);
        if (shoppingCarts.size()==0)
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);

        //向订单表插入一条数据
        Orders order = new Orders();
        BeanUtils.copyProperties(dto,order);
        order.setOrderTime(LocalDateTime.now());
        order.setPayStatus(Orders.UN_PAID);
        order.setStatus(Orders.PENDING_PAYMENT);
        order.setNumber(String.valueOf(System.currentTimeMillis()));
        order.setPhone(address.getPhone());
        order.setConsignee(address.getConsignee());
        order.setUserId(id);
        //查询用户地址表
        AddressBook addressBook = addressBookMapper.selectById(dto.getAddressBookId());
        order.setUserName(addressBook.getConsignee());
        order.setAddress(addressBook.getProvinceName()+addressBook.getCityName()+addressBook.getDistrictName()+addressBook.getDetail());
        orderMapper.insert(order);
        Long orderId = order.getId();
        List<OrderDetail> orderDetails = new ArrayList<>(shoppingCarts.size());
        //向订单明细表插入n条数据
        for (int i = 0; i < shoppingCarts.size(); i++) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(shoppingCarts.get(i),orderDetail);
            orderDetail.setOrderId(orderId);
            orderDetails.add(orderDetail);

        }
        orderDetailMapper.insert(orderDetails);

        //清空购物车
        QueryWrapper<ShoppingCart> deleteWrapper = new QueryWrapper<>();
        deleteWrapper.eq("user_id",id);
        shoppingCartMapper.delete(deleteWrapper);
        OrderSubmitVO orderSubmitVO = new OrderSubmitVO();
        orderSubmitVO.setId(orderId);
        orderSubmitVO.setOrderTime(order.getOrderTime());
        orderSubmitVO.setOrderNumber(order.getNumber());
        orderSubmitVO.setOrderAmount(order.getAmount());

        return orderSubmitVO;
    }

    @Override
    public PageResult pageQuery4User(int pageNum, int pageSize, Integer status) {
        // 设置分页
        PageHelper.startPage(pageNum, pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        // 分页条件查询
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList<>( page.size());

        // 查询出订单明细，并封装入OrderVO进行响应
        if (page.getTotal() > 0) {
            List<Long> orderIds = page.stream().map(v -> v.getUserId()).collect(Collectors.toList());
            QueryWrapper<OrderDetail> wrapper = new QueryWrapper<>();
            wrapper.in("order_id",orderIds);
            List<OrderDetail> orderDetails = orderDetailMapper.selectList(wrapper);
            for (Orders order : page) {
                List<OrderDetail> orderDetail = orderDetails.stream().filter(v -> Objects.equals(v.getOrderId(), order.getId())).collect(Collectors.toList());

                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(order, orderVO);
                orderVO.setOrderDetailList(orderDetail);
                list.add(orderVO);
            }
        }
        return new PageResult(page.getTotal(), list);
    }
    public OrderVO details(Long id) {
        // 根据id查询订单
        Orders orders = orderMapper.selectById(id);

        // 查询该订单对应的菜品/套餐明细
        QueryWrapper<OrderDetail> wrapper = new QueryWrapper<>();
        wrapper.eq("order_id",orders.getId());
        List<OrderDetail> orderDetailList = orderDetailMapper.selectList(wrapper);

        // 将该订单及其详情封装到OrderVO并返回
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setOrderDetailList(orderDetailList);

        return orderVO;
    }

    @Override
    public void userCancelById(Long id) {
        Orders ordersDB = orderMapper.selectById(id);

        // 校验订单是否存在
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        //订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        if (ordersDB.getStatus() > 2) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }


        ordersDB.setId(ordersDB.getId());


        //支付状态修改为 退款
        // TODO: 2025年7月3日 向微信支付发起退款请求
        ordersDB.setPayStatus(Orders.REFUND);


        // 更新订单状态、取消原因、取消时间
        ordersDB.setStatus(Orders.CANCELLED);
        ordersDB.setCancelReason("用户取消");
        ordersDB.setCancelTime(LocalDateTime.now());
        orderMapper.updateById(ordersDB);
    }

    @Override
    public void repetition(Long id) {
        // 查询当前用户id
        Long userId = BaseContext.getCurrentId();

        // 根据订单id查询当前订单详情
        QueryWrapper<OrderDetail> wrapper = new QueryWrapper<>();
        wrapper.eq("order_id",id);
        List<OrderDetail> orderDetailList = orderDetailMapper.selectList(wrapper);

        // 将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            // 将原订单详情里面的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x, shoppingCart, "id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        // 将购物车对象批量添加到数据库
        shoppingCartMapper.insert(shoppingCartList);
    }

    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());

        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        // 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);

        return new PageResult(page.getTotal(), orderVOList);
    }

    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        // 需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();

        List<Orders> ordersList = page.getResult();
        if (!CollectionUtils.isEmpty(ordersList)) {
            for (Orders orders : ordersList) {
                // 将共同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                String orderDishes = getOrderDishesStr(orders);

                // 将订单菜品信息封装到orderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }

    private String getOrderDishesStr(Orders orders) {
        // 查询订单菜品详情信息（订单中的菜品和数量）
        QueryWrapper<OrderDetail> wrapper = new QueryWrapper<>();
        wrapper.eq("order_id",orders.getId());
        List<OrderDetail> orderDetailList = orderDetailMapper.selectList(wrapper);

        // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            return x.getName() + "*" + x.getNumber() + ";";
        }).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("", orderDishList);
    }
    @Override
    public OrderStatisticsVO statistics() {
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);

        // 将查询出的数据封装到orderStatisticsVO中响应
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);
        return orderStatisticsVO;
    }

    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders = new Orders();
        orders.setId(ordersConfirmDTO.getId());
        orders.setStatus(Orders.CONFIRMED);
        orderMapper.updateById(orders);
    }

    @Override
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.selectById(ordersRejectionDTO.getId());

        // 订单只有存在且状态为2（待接单）才可以拒单
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

//        //支付状态
//        Integer payStatus = ordersDB.getPayStatus();
//        if (payStatus == Orders.PAID) {
//            //用户已支付，需要退款
//            String refund = weChatPayUtil.refund(
//                    ordersDB.getNumber(),
//                    ordersDB.getNumber(),
//                    new BigDecimal(0.01),
//                    new BigDecimal(0.01));
//            log.info("申请退款：{}", refund);
//        }

        // 拒单需要退款，根据订单id更新订单状态、拒单原因、取消时间
        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setRejectionReason(ordersRejectionDTO.getRejectionReason());
        orders.setCancelTime(LocalDateTime.now());

        orderMapper.updateById(orders);
    }

    @Override
    public void cancel(OrdersCancelDTO ordersCancelDTO) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.selectById(ordersCancelDTO.getId());

        //支付状态
        Integer payStatus = ordersDB.getPayStatus();
//        if (payStatus == 1) {
//            //用户已支付，需要退款
//            String refund = weChatPayUtil.refund(
//                    ordersDB.getNumber(),
//                    ordersDB.getNumber(),
//                    new BigDecimal(0.01),
//                    new BigDecimal(0.01));
//            log.info("申请退款：{}", refund);
//        }

        // 管理端取消订单需要退款，根据订单id更新订单状态、取消原因、取消时间
        Orders orders = new Orders();
        orders.setId(ordersCancelDTO.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason(ordersCancelDTO.getCancelReason());
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.updateById(orders);
    }

    @Override
    public void delivery(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.selectById(id);

        // 校验订单是否存在，并且状态为3
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为派送中
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);

        orderMapper.updateById(orders);
    }

    @Override
    public void complete(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.selectById(id);

        // 校验订单是否存在，并且状态为4
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为完成
        orders.setStatus(Orders.COMPLETED);
        orders.setDeliveryTime(LocalDateTime.now());

        orderMapper.updateById(orders);
    }

    @Override
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.selectById(userId);

        //调用微信支付接口，生成预支付交易单
        /*JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), //商户订单号
                new BigDecimal(0.01), //支付金额，单位 元
                "苍穹外卖订单", //商品描述
                user.getOpenid() //微信用户的openid
        );

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }*/

        JSONObject jsonObject = new JSONObject();
        jsonObject.put("code", "ORDERPAID");
        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        //为替代微信支付成功后的数据库订单状态更新，多定义一个方法进行修改
        Integer OrderPaidStatus = Orders.PAID; //支付状态，已支付
        Integer OrderStatus = Orders.TO_BE_CONFIRMED;  //订单状态，待接单


        LocalDateTime check_out_time = LocalDateTime.now();

        //获取订单号码
        String orderNumber = ordersPaymentDTO.getOrderNumber();


        orderMapper.updateStatus(OrderStatus, OrderPaidStatus, check_out_time, orderNumber);



        //使用websocket通知后台
        QueryWrapper<Orders> wrapper = new QueryWrapper<Orders>();
        wrapper.eq("number",ordersPaymentDTO.getOrderNumber());
        Orders orders = orderMapper.selectOne(wrapper);

        HashMap<Object, Object> map = new HashMap<>();
        map.put("type",1);
        map.put("orderId",orders.getId());
        map.put("content","订单号"+ordersPaymentDTO.getOrderNumber());
        String s = JSON.toJSONString(map);
        server.sendToAllClient(s);
        return vo;

    }

    @Override
    public void reminder(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.selectById(id);

        // 校验订单是否存在，并且状态为3
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        HashMap<Object, Object> map = new HashMap<>();
        map.put("type",2);
        map.put("orderId",id);
        map.put("content","订单号，"+ordersDB.getNumber());
        server.sendToAllClient(JSON.toJSONString(map));
    }
}
